Orthoclase Lorenzenite. Comments: Striated, dark violet crystal of lorenzenite in cream-colored orthoclase. Location: Khibiny Massif, Kola Peninsula, Russia.
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Acanthite is the most important silver ore next to galena. Actually there is an argument to be made that acanthite could be the most important silver ore.
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Silicates. The first silicate products, such as a pottery, were obtained at the down of civilization. The age of the earliest fragments of man-made burnt clay ...
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Minerals are not equivalent to rocks. A rock is either an aggregate of one or more minerals or mineraloids. Some rocks, such as limestone or quartzite, are composed ...
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Information about specific rocks and minerals. ... Obsidian Obsidian is volcanic glass. Oligoclase Oligoclase has the formulae (Na,Ca)AlSi3O8 and a relative hardness ...
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The Elements (which include over one hundred known minerals) are a diverse class when taken as a whole. Most of this diversity, however, is due to the diversity of ...
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Main index--- Minerals list--- Hardness index Silicates All silicates have formula SiO 2. Opal also has some extra water in its molecule. The silicates are the ...
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Acanthite is the most important silver ore next to galena. Actually there is an argument to be made that acanthite could be the most important silver ore.
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The BEST Place to Learn about Rocks and Minerals. Presented by the Mineralogical Society of America
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Staurolite. Comments: Cruciform twinned staurolite crystals without matrix. Location: Marble, Cherokee Co., North Carolina, USA. Scale: 3x2.5x1.5 cm.
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The most abundant minerals in the crust. More than 90% on the crust is composed of silicate minerals. Most abundant silicates are feldspars (plagioclase (39%) and ...
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Complete online glossary of rocks, minerals, and gemstones.
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Streak is the color of a crushed mineral's powder. The color of a mineral's powder may differ from the actual color of the mineral. This property can be useful ...
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Silicate minerals are rock-forming minerals made up of silicate groups. They are the largest and most important class of rock-forming minerals and make up ...
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Complete online glossary of rocks, minerals, and gemstones.
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Need some information about specific rocks and minerals.
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Need some information about specific rocks and minerals.
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Minerals and Their Uses. Every segment of society uses minerals and mineral resources everyday. The roads we ride or drive on
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Scientific Classification **Minerals and gemstones are classified according to their chemical compositions. There are eight classes, along with a ninth class for non ...
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The most abundant minerals in the crust. More than 90% on the crust is composed of silicate minerals. Most abundant silicates are feldspars (plagioclase (39%) and ...
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Staurolite. Comments: Cruciform twinned staurolite crystals without matrix. Location: Marble, Cherokee Co., North Carolina, USA. Scale: 3x2.5x1.5 cm.
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Streak is the color of a crushed mineral's powder. The color of a mineral's powder may differ from the actual color of the mineral. This property can be useful ...
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1.2 Sheet silicates (phyllosilicates) An important group of minerals, especially within the topmost 20 kilometers of the crust. All sheet silicates are hydrous.
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Namibia is well known as having an abundance of minerals, gems and semi precious stones
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Information about specific rocks and minerals. ... Obsidian Obsidian is volcanic glass. Oligoclase Oligoclase has the formulae (Na,Ca)AlSi3O8 and a relative hardness ...
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Namibia is well known as having an abundance of minerals, gems and semi precious stones
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